JP7645175B2 - Solar cell module and method for manufacturing the solar cell module - Google Patents

Description

This disclosure relates to solar cell modules and methods for manufacturing solar cell modules.

The solar cell module has a structure in which multiple solar cells are electrically connected by wiring material between a protective member on the light-receiving surface side and a protective member on the back surface side, and are sealed with a filler material on both the light-receiving surface side and the back surface side (see, for example, the description in Patent Document 1).

Patent No. 6226294

There is room for improvement in solar cell modules to make them less susceptible to deterioration.

A solar cell module and a method for manufacturing a solar cell module are disclosed.

One aspect of the solar cell module includes a first protective member having a plate-like or film-like translucency, a second protective member having a plate-like or film-like translucency, a power generation unit, a first sealing material, a second sealing material, and a third sealing material. The first protective member has a first surface and a second surface opposite to the first surface. The second protective member has a third surface facing the second surface and a fourth surface opposite to the third surface. The power generation unit includes a plurality of solar cell cells located along the second surface in the gap between the first protective member and the second protective member. The first sealing material is located at least between the second surface and the power generation unit, and seals the power generation unit from the first protective member side. The second sealing material is located at least between the third surface and the power generation unit, and seals the power generation unit from the second protective member side. The plurality of solar cell cells includes two or more solar cell cells arranged in a first direction along the second surface. The two or more solar cells include a first solar cell located at an end of the two or more solar cells in the first direction. The power generation unit includes a solar cell string including the two or more solar cells, a plurality of first string-shaped wiring portions, and a plurality of second string-shaped wiring portions, and a connecting wiring portion. The plurality of first string-shaped wiring portions electrically connect the two or more solar cells. The plurality of second string-shaped wiring portions are electrically connected to the first solar cell and extend to a region of the gap that is located further in the first direction than the first solar cell. The connecting wiring portion connects the plurality of second string-shaped wiring portions. The plurality of second string-shaped wiring portions include a plurality of bridge portions bridged between the first solar cell and the connecting wiring portion. The third sealing material is located between one or more bridge portions of the plurality of bridge portions and the first sealing material. The melt mass flow rate of the third sealing material is smaller than the melt mass flow rate of the first sealing material. The softening temperature of the third sealing material is equal to or higher than the softening temperature of the first sealing material.

One aspect of the method for manufacturing a solar cell module includes: (a) a step of producing a laminated body by laminating a plate-shaped or film-shaped first protective member having translucency, a sheet-shaped first resin material, a sheet-shaped second resin material, a power generation section including a plurality of solar cells, a sheet-shaped third resin material, and a plate-shaped or film-shaped second protective member; and (b) a step of laminating the laminated body to produce a solar cell panel. The plurality of solar cells includes two or more solar cells arranged in a first direction. The two or more solar cells include a first solar cell located at an end of the two or more solar cells in the first direction. The power generation section includes a solar cell string including the two or more solar cells, a plurality of first string-shaped wiring parts, and a plurality of second string-shaped wiring parts, and a connecting wiring part. The plurality of first string-shaped wiring parts electrically connect the two or more solar cells. The plurality of second string-shaped wiring parts are electrically connected to the first solar cell and extend to a region located in the first direction beyond the first solar cell. The connecting wiring portion connects the plurality of second string-like wiring portions. The plurality of second string-like wiring portions include a plurality of bridging portions bridged between the first solar cell and the connecting wiring portion. In the step (a), the second resin material is disposed between the first resin material and one or more of the plurality of bridging portions. In the step (b), the laminate is heated to a temperature exceeding the softening temperatures of the first resin material, the second resin material, and the third resin material. The melt mass flow rate of the second resin material at the heating temperature of the lamination process is smaller than the melt mass flow rate of the first resin material at the heating temperature of the lamination process .

For example, solar cell modules are less likely to deteriorate.

FIG. 1 is a plan view showing an example of the appearance of a solar cell module according to a first embodiment. FIG. 2 is a plan view showing an example of the appearance of the solar cell panel according to the first embodiment. FIG. 3 is a diagram showing an example of a virtual cross section of the solar cell panel taken along line III-III of FIG. FIG. 4 is a plan view showing an example of the structure of the front surface side of the first solar cell. FIG. 5 is a plan view showing an example of the structure of the back surface side of the first solar cell. FIG. 6 is a plan view showing an example of the structure of the front surface side of the second solar cell. FIG. 7 is a plan view showing an example of the structure of the back surface side of the second solar cell. FIG. 8 is a plan view showing an example of the structure of the front surface side of the third solar cell. FIG. 9 is a plan view showing an example of the structure of the back surface side of the third solar cell. FIG. 10 is an enlarged view showing a portion X in FIG. FIG. 11 is an enlarged view showing a portion XI in FIG. FIG. 12 is a flow chart showing an example of the flow of the method for manufacturing the solar cell panel according to the first embodiment. FIG. 13 is a cross-sectional view that illustrates an example of a state before a lamination step in the manufacture of a solar cell panel according to the first embodiment. FIG. 14 is a cross-sectional view that illustrates an example of a state after a lamination step in the manufacture of the solar cell panel according to the first embodiment. FIG. 15 is an enlarged view showing a portion XV in FIG. FIG. 16 is an enlarged view showing a portion XVI in FIG. FIG. 17 is a diagram showing an example of a stacking relationship between a first protective member, a first resin material, a second resin material, and a power generating section during a stacking step in the manufacture of a solar cell module. FIG. 18 is a plan view showing an example of the appearance of a solar cell panel according to a first modified example. FIG. 19 is a diagram showing an example of a stacking relationship between a first protective member, a first resin material, a second resin material, and a power generating section during a stacking process during the manufacture of a solar cell panel according to the first modified example. FIG. 20 is a plan view showing an example of the appearance of a solar cell panel according to the second modified example. FIG. 21 is a diagram showing an example of a stacking relationship between a first protective member, a first resin material, a second resin material, and a power generating section during a stacking process during the manufacture of a solar cell panel according to the second modified example. FIG. 22 is an enlarged view showing a portion of a solar cell panel according to a third modified example, which corresponds to the portion X in FIG. FIG. 23 is a plan view showing an example of the appearance of a solar cell panel according to the fourth modified example. FIG. 24 is an enlarged view showing a portion corresponding to the portion X in FIG. 3 in a solar cell panel according to a fourth modified example. FIG. 25 is a diagram showing an example of a stacking relationship between a first protective member, a first resin material, a second resin material, and a power generating section during a stacking process during the manufacture of a solar cell panel according to the fourth modified example. FIG. 26 is an enlarged view showing a portion corresponding to the portion XV in FIG. 14 in an example of a state after a lamination step in the manufacture of a solar cell panel according to the fourth modified example. FIG. 27 is an enlarged view showing a portion corresponding to portion XI in FIG. 3 in a solar cell panel according to a fourth modified example. FIG. 28 is an enlarged view showing a portion corresponding to the portion XVI in FIG. 14 in an example of a state after a lamination step in the manufacture of a solar cell panel according to the fourth modified example. FIG. 29 is a cross-sectional view showing a cross section of a first example of the first to third string-like wiring portions. FIG. 30 is a cross-sectional view showing a cross section of a second example of the first to third string-like wiring portions. FIG. 31 is a cross-sectional view showing a cross section of a third example of the first to third string-like wiring portions. FIG. 32 is a cross-sectional view showing a cross section of a fourth example of the first to third string-like wiring portions.

The solar cell module has a structure in which a power generating section, in which multiple solar cells are electrically connected by wiring material, is sealed with a filler material from both the light receiving side and the back side between a protective member on the light receiving side and a protective member on the back side.

This solar cell module can be manufactured, for example, by integrating a laminate made of a protective member on the light-receiving surface side, a sheet-like resin material, a power generation section to which multiple solar cells are electrically connected, a sheet-like resin material, and a protective member on the back surface side through a lamination process. In the lamination process, the laminate is heated, pressurized, and vacuum degassed.

In solar cell modules, for example, the number of wiring members connecting multiple solar cells is increasing and the wiring is becoming thinner in order to improve power generation performance. Thinner wiring members have a string-like shape with a circular cross section, for example, with a diameter of about 0.3 millimeters (mm).

However, by making the wiring material thinner, the resistance that the wiring material experiences from the molten resin when it moves through the molten resin during lamination processing, for example, is reduced. This can cause the wiring material to move a relatively long distance through the molten resin. In particular, for example, in the outer periphery of the power generation unit, the wiring material extending from the solar cell strings, each of which includes two or more solar cells connected by wiring material, is more likely to move in parts that are away from the parts fixed to the solar cells. As a result, for example, between the protective member on the light-receiving surface side and the wiring material, parts where the filler material on the light-receiving surface side is thin can be generated.

In such areas where the filler on the light-receiving surface side is thin, the insulation is likely to deteriorate due to exposure to a high electric field that occurs between the power generating section and the protective member on the light-receiving surface side when a water film is formed on the surface due to rainwater or moisture, and to the diffusion of ions such as sodium ions from the protective member on the surface side. For example, the filler on the light-receiving surface side is likely to peel off from the protective member on the light-receiving surface side, reducing the sealing performance of the filler and making the solar cell more susceptible to deterioration due to water ingress.

For this reason, there is room for improvement in solar cell modules to make them less susceptible to deterioration.

Therefore, the inventors of this disclosure have created a technology that can reduce the risk of deterioration of solar cell modules.

In the following, various embodiments will be described with reference to the drawings. In the drawings, parts having similar configurations and functions are given the same reference numerals, and duplicated explanations will be omitted in the following description. The drawings are schematic. Figures 1 to 11 and 13 to 32 are illustrated with a right-handed XYZ coordinate system. In this XYZ coordinate system, the direction in which two or more solar cell cells 31 are arranged in the solar cell string 3s is the +Y direction, the direction in which multiple solar cell strings 3s are arranged is the +X direction, and the direction perpendicular to both the +X direction and the +Y direction is the +Z direction.

<1. First embodiment>
<1-1. Structure of solar cell module>
A solar cell module 100 according to a first embodiment will be described with reference to FIGS. 1 to 11. FIG.

As shown in FIG. 1, the solar cell module 100 includes, for example, a solar cell panel 101 and a frame 102. The solar cell panel 101 has, for example, a flat plate shape. The frame 102 is located, for example, along the outer periphery of the solar cell panel 101. This allows the frame 102 to protect, for example, the outer periphery of the solar cell panel 101. Here, a resin material with low moisture permeability, such as a butyl-based resin, may be filled between the outer periphery of the solar cell panel 101 and the frame 102. For example, aluminum or an aluminum alloy is used as the material of the frame 102. The solar cell module 100 may not include, for example, the frame 102. In this case, for example, the solar cell module 100 includes at least the solar cell panel 101.

As shown in Figs. 1 to 3, the solar cell panel 101 has a light receiving surface (also called the front surface) F1 onto which light is mainly incident, and a surface (also called the back surface) F2 on the opposite side of the front surface F1. In the first embodiment, the front surface F1 faces the +Z direction. The back surface F2 faces the -Z direction. When using the solar cell module 100, the +Z direction is set to, for example, a direction facing the sun at its zenith moment. In the example of Figs. 1 to 3, the front surface F1 has a rectangular shape. The solar cell module 100 may include, for example, a terminal box (not shown). The terminal box is located, for example, on the back surface F2 of the solar cell panel 101, and can output electricity generated by the power generation in the solar cell panel 101 to the outside.

As shown in Figures 2 and 3, the solar cell panel 101 includes, for example, a first protective member 1, a second protective member 2, a power generating unit 3, and a sealing material 4. Here, for example, the first protective member 1 and the second protective member 2 are positioned to sandwich the power generating unit 3. The first protective member 1 constitutes, for example, the front surface F1 of the solar cell panel 101. The second protective member 2 constitutes, for example, the back surface F2 of the solar cell panel 101.

<<First Protective Member>>
The first protective member 1 is a member that protects the power generating unit 3 from the front surface F1 side of the solar cell panel 101. The first protective member 1 has translucency. The first protective member 1 has translucency for light of a specific range of wavelengths, for example. The specific range of wavelengths includes, for example, the wavelength of light that the power generating unit 3 can photoelectrically convert. As a result, for example, light irradiated to the front surface F1 can be transmitted through the first protective member 1 toward the power generating unit 3. For example, if the specific range of wavelengths includes the wavelength of light with high irradiation intensity that constitutes sunlight, the photoelectric conversion efficiency of the solar cell module 100 can be improved. For example, glass or the like is applied as a material for the first protective member 1. The first protective member 1 has a first surface 1f and a second surface 1s. The second surface 1s is the surface opposite to the first surface 1f. In the first embodiment, the first surface 1f constitutes the front surface F1 of the solar cell panel 101. In the examples of FIG. 1 to FIG. 3, the first surface 1f faces the +Z direction, and the second surface 1s faces the -Z direction.

The first protective member 1 has, for example, a plate-like shape. Specifically, for example, a flat glass plate is applied to the first protective member 1. In this case, the first surface 1f is a flat plate surface (also referred to as the first plate surface). The second surface 1s is a flat plate surface (also referred to as the second plate surface) facing in the opposite direction to the first plate surface. The first protective member 1 has an outer peripheral surface connecting the first surface 1f and the second surface 1s. The thickness of the first protective member 1 is set to, for example, about 1 mm to 5 mm. In the example of FIG. 2, when viewed in plan from the front surface F1 side, the outer shape of the first protective member 1 is rectangular. In other words, the first surface 1f and the second surface 1s are each rectangular in shape. The first protective member 1 having the above configuration can protect the power generation unit 3 from the front surface F1 side, for example, by having high rigidity and low moisture permeability.

<<Second Protective Member>>
The second protective member 2 is a member that protects the power generating unit 3 from the back surface F2 side of the solar cell panel 101. The second protective member 2 may have light-transmitting properties like the first protective member 1, or may not have light-transmitting properties. The second protective member 2 has a third surface 2t and a fourth surface 2f. The third surface 2t faces the second surface 1s of the first protective member 1. The fourth surface 2f is the surface opposite to the third surface 2t. In the second embodiment, the fourth surface 2f constitutes the back surface F2 of the solar cell panel 101. In the examples of FIGS. 1 to 3, the third surface 2t faces the +Z direction, and the fourth surface 2f faces the -Z direction. In this case, the third surface 2t faces the second surface 1s in the +Z direction.

The second protective member 2 has, for example, a membrane-like (also referred to as a film-like) shape. For example, a flexible sheet-like member is applied to the second protective member 2. The thickness of the second protective member 2 is, for example, about 0.3 mm to 0.5 mm. In the example of FIG. 3, the second protective member 2 is positioned so as to envelop the power generating unit 3 and the sealing material 4 from the back surface F2 side and the outer peripheral side of the solar cell panel 101. And, for example, the outer peripheral portion of the second protective member 2 is positioned so as to approach the outer peripheral portion of the second surface 1s of the first protective member 1 and to be attached via the first sealing material 41 and the second sealing material 42 described later. For example, one or more types of resins selected from polypropylene, polyolefin, and polyethylene terephthalate (PET) are applied as the material of the sheet-like member. In the example of FIG. 1 and FIG. 2, when viewed from the front surface F1 side, the outer shape of the second protective member 2 is rectangular. In other words, the shapes of the third surface 2t and the fourth surface 2f are rectangular. The second protective member 2 having the above configuration can protect the power generating unit 3 from the back surface F2 side by, for example, being water resistant and waterproof.

<<Power Generation Division>>
The power generating unit 3 is located in a gap 101g between the first protective member 1 and the second protective member 2. The power generating unit 3 includes, for example, a plurality of solar cells 31 and a plurality of wiring units 32.

The plurality of solar cells 31 are located along the second surface 1s of the first protective member 1 in the gap 101g. The plurality of solar cells 31 includes, for example, two or more solar cells 31 arranged in the -Y direction as a first direction along the second surface 1s of the first protective member 1. In the first embodiment, the plurality of solar cells 31 are arranged two-dimensionally. In the example of FIG. 1 to FIG. 3, the plurality of solar cells 31 are positioned in a planar arrangement along a virtual plane (also called a virtual plane) parallel to the XY plane. The plurality of solar cells 31 include two or more solar cells 31 arranged in the +X direction as a second direction intersecting the first direction along the second surface 1s. More specifically, for example, the plurality of solar cells 31 includes N columns (N is a natural number equal to or greater than 2) of solar cells 31, each of which includes M solar cells 31 (M is a natural number equal to or greater than 2). In other words, the plurality of solar cells 31 are arranged in a matrix of M rows and N columns. In the examples shown in Figures 1 to 3, M is 3 and N is 6.

Each of the multiple solar cell 31 can, for example, convert light energy into electrical energy.

As shown in Figures 4 to 9, each of the multiple solar cell cells 31 has a surface (also called the first element surface) F3 located on the front surface side, and a surface (also called the second element surface) F4 on the opposite side of the first element surface F3. In the examples of Figures 4 to 9, the first element surface F3 faces the +Z direction, and the second element surface F4 faces the -Z direction. In this case, for example, the first element surface F3 mainly serves as a surface onto which light is incident (also called the light receiving surface or front surface), and the second element surface F4 mainly serves as a surface onto which light is not incident (also called the back surface).

In the first embodiment, as shown in Figures 4 to 9, each of the multiple solar cells 31 has a semiconductor substrate 31a, a first output extraction electrode 31b, a first collector electrode 31c, a second output extraction electrode 31d, and a second collector electrode 31e.

For example, a crystalline semiconductor such as crystalline silicon, an amorphous semiconductor such as amorphous silicon, or a compound semiconductor using four elements, copper, indium, gallium, and selenium, or two elements, cadmium and tellurium, is applied to the semiconductor substrate 31a. Here, when crystalline silicon is applied to the semiconductor substrate 31a, the semiconductor substrate 31a has a region having a first conductivity type (also called a first conductivity type region) and a region having a second conductivity type opposite to the first conductivity type (also called a second conductivity type region). The first conductivity type region is located, for example, on the second element surface F4 side of the semiconductor substrate 31a. The second conductivity type region is located, for example, on the surface layer portion of the first element surface F3 side of the semiconductor substrate 31a. Here, for example, when the first conductivity type is p-type, the second conductivity type is n-type. For example, when the first conductivity type is n-type, the second conductivity type is p-type. As a result, the semiconductor substrate 31a has a pn junction located at the interface between the first conductivity type region and the second conductivity type region.

The first output extraction electrode 31b and the first collector electrode 31c are located, for example, on the surface of the semiconductor substrate 31a on the first element surface F3 side. For example, a bus bar electrode is applied to the first output extraction electrode 31b. For example, a finger electrode is applied to the first collector electrode 31c. In the examples of Figures 4, 6, and 8, six substantially parallel first output extraction electrodes 31b are located on the first element surface F3 side, and a large number of substantially parallel first collector electrodes 31c are located so as to be substantially perpendicular to the six first output extraction electrodes 31b. The first output extraction electrode 31b has an elongated shape with a longitudinal direction along the -Y direction as the first direction. The first collector electrode 31c has an elongated shape with a longitudinal direction along the +X direction as the second direction. The number of first output extraction electrodes 31b in the solar cell 31 may be any number between six and twelve, for example. In the region on the second conductive type region of the semiconductor substrate 31a where the first output extraction electrode 31b and the first current collecting electrode 31c are not formed, an insulating film as an anti-reflection film 31f made of, for example, silicon nitride may be located. Here, for example, when the main component of the first output extraction electrode 31b is silver, the first output extraction electrode 31b can be formed by applying a silver paste to a desired shape by screen printing or the like and then firing it. The main component means a component that has the largest (highest) content ratio (also called the content rate) among the contained components. For example, a metal paste containing a metal powder containing silver as the main component, an organic vehicle, and a glass frit is applied as the silver paste. For example, when the main component of the first current collecting electrode 31c is silver, the first current collecting electrode 31c can be formed by applying a silver paste to a desired shape by screen printing or the like and then firing it, similar to the first output extraction electrode 31b. The first output extraction electrode 31b and the first current collecting electrode 31c may be formed, for example, in separate processes or in the same process.

The second output extraction electrode 31d and the second collecting electrode 31e are located, for example, on the surface of the semiconductor substrate 31a on the second element surface F4 side. For example, a bus bar electrode is applied to the second output extraction electrode 31d. In the examples of Figures 5, 7, and 9, six second output extraction electrodes 31d are located substantially parallel to each other on the second element surface F4 side. Each second output extraction electrode 31d has a longitudinal direction along the -Y direction as the first direction. The second collecting electrode 31e is located on the second element surface F4 side over substantially the entire area where the second output extraction electrode 31d is not formed, except for the portion where the second output extraction electrode 31d and the second collecting electrode 31e are connected to each other by overlapping each other. Each second output extraction electrode 31d has, for example, a plurality (for example, four) of island-shaped electrodes 31d1 arranged along the -Y direction as the first direction. Here, for example, a thin film of an oxide or nitride such as aluminum oxide may be present as a passivation film in a desired pattern between the first conductive region of the semiconductor substrate 31a and the second output extraction electrode 31d and the second current collecting electrode 31e. For example, if the main component of the second output extraction electrode 31d is silver, the second output extraction electrode 31d may be formed by applying a silver paste to a desired shape by screen printing or the like and then firing it, similar to the first output extraction electrode 31b. For example, if the main component of the second current collecting electrode 31e is aluminum, the second current collecting electrode 31e may be formed by applying an aluminum paste to a desired shape by screen printing or the like and then firing it. For the aluminum paste, for example, a metal paste containing a metal powder containing aluminum as the main component, an organic vehicle, and a glass frit is applied.

The power generation unit 3 also includes a solar cell string 3s. In the first embodiment, the power generation unit 3 includes a plurality of solar cell strings 3s. In the example of FIG. 1 and FIG. 2, the plurality of solar cell strings 3s includes six solar cell strings 3s. The six solar cell strings 3s include a first solar cell string 3s1, a second solar cell string 3s2, a third solar cell string 3s3, a fourth solar cell string 3s4, a fifth solar cell string 3s5, and a sixth solar cell string 3s6. The first solar cell string 3s1, the second solar cell string 3s2, the third solar cell string 3s3, the fourth solar cell string 3s4, the fifth solar cell string 3s5, and the sixth solar cell string 3s6 are arranged in the +X direction as the second direction in the order described here. Each of the plurality of solar cell strings 3s has a similar configuration. In the example of FIG. 1 and FIG. 2, two adjacent solar cell strings 3s have a configuration that is rotationally symmetrical with respect to a virtual axis parallel to the Z axis.

For example, each of the multiple solar cell strings 3s includes two or more solar cell cells 31 arranged in the -Y direction as the first direction, multiple first string-like wiring portions 321, and multiple second string-like wiring portions 322. Also, for example, the solar cell string 3s includes multiple third string-like wiring portions 323. In other words, the multiple wiring portions 32 in the power generation unit 3 include multiple first string-like wiring portions 321, multiple second string-like wiring portions 322, and multiple third string-like wiring portions 323.

In the examples of Figures 1 to 3, each of the multiple solar cell strings 3s has three solar cell cells 31 as two or more solar cell cells 31. The three solar cell cells 31 include a first solar cell 31 (also referred to as a first solar cell) 311, a second solar cell 31 (also referred to as a second solar cell) 312, and a third solar cell 31 (also referred to as a third solar cell) 313. The first solar cell 311, the second solar cell 312, and the third solar cell 313 are arranged in the order described in the +Y direction. In other words, for example, the two or more solar cell cells 31 constituting the solar cell string 3s include the first solar cell 311 located at the end of the -Y direction as the first direction. For example, the two or more solar cell cells 31 constituting the solar cell string 3s include the third solar cell 313 located at the end of the +Y direction as the third direction opposite to the first direction.

The first string-like wiring parts 321 electrically connect two or more solar cells 31 in the solar cell string 3s. Here, each of the first string-like wiring parts 321 electrically connects two or more solar cells 31 adjacent to each other among the solar cells 31. Specifically, each of the first string-like wiring parts 321 electrically connects, for example, the first output extraction electrode 31b of one solar cell 31 to the second output extraction electrode 31d of another solar cell 31 adjacent to this one solar cell 31. In Figures 4 to 9, the outer edge of the first string-like wiring part 321 attached to each of the multiple solar cells 31 is virtually drawn with a two-dot chain line. Here, the first string-like wiring part 321 is, for example, in a state of being joined to the first output extraction electrode 31b and the second output extraction electrode 31d. The first string-like wiring portion 321 can be joined to the first output extraction electrode 31b and the second output extraction electrode 31d using, for example, a low-melting-point alloy such as solder or a low-melting-point simple metal.

Each of the second string-shaped wiring parts 322 is electrically connected to the first solar cell 311 located at the end of the -Y direction as the first direction among the two or more solar cells 31 in the solar cell string 3s. Each of the second string-shaped wiring parts 322 extends to a region (also called a first region) A1 located in the -Y direction as the first direction from the first solar cell 311 in the gap 101g. In the example of FIG. 2 and FIG. 3, each of the second string-shaped wiring parts 322 extends in the -Y direction as the first direction in the first region A1. In the example of FIG. 4 and FIG. 5, each of the second string-shaped wiring parts 322 is connected to, for example, the second output extraction electrode 31d of the first solar cell 311. In FIG. 4 and FIG. 5, the outer edge of the second string-shaped wiring part 322 attached to the first solar cell 311 is virtually drawn by a two-dot chain line. In the example of Figures 4 and 5, the second string-like wiring portion 322 is, for example, joined to the second output extraction electrode 31d. More specifically, six second string-like wiring portions 322 are joined to six second output extraction electrodes 31d. The second string-like wiring portions 322 are joined to the second output extraction electrodes 31d using, for example, a low-melting-point alloy such as solder or a low-melting-point single metal.

The third string-like wiring parts 323 are electrically connected to the third solar cell 313 located at the end of the two or more solar cell cells 31 in the solar cell string 3s in the +Y direction as the third direction opposite to the first direction. The third string-like wiring parts 323 extend to a region (also called the second region) A2 located in the +Y direction as the third direction from the third solar cell 313 in the gap 101g. In the example of Fig. 2 and Fig. 3, each of the third string-like wiring parts 323 extends in the +Y direction as the third direction in the second region A2. In the example of Fig. 8 and Fig. 9, each of the third string-like wiring parts 323 is connected to, for example, the first output extraction electrode 31b of the third solar cell 313. In Fig. 8 and Fig. 9, the outer edge of the third string-like wiring part 323 attached to the third solar cell 313 is virtually drawn by a two-dot chain line. In the example of Figures 8 and 9, the third string-like wiring portion 323 is, for example, joined to the first output extraction electrode 31b. More specifically, six third string-like wiring portions 323 are joined to six first output extraction electrodes 31b. The third string-like wiring portions 323 are joined to the first output extraction electrodes 31b using, for example, a low-melting-point alloy such as solder or a low-melting-point single metal.

Each of the first string-like wiring portion 321, the second string-like wiring portion 322, and the third string-like wiring portion 323 is, for example, a conductive metal wire. For example, a copper wire with a cross-sectional diameter of about 0.1 mm to 0.5 mm is used as the wire. This copper wire is used with its outer surface coated with, for example, a low-melting-point alloy such as solder or a low-melting-point simple metal.

The multiple wiring sections 32 in the power generation section 3 include multiple connecting wiring sections (also called horizontal wiring) 324. In the example of Figures 1 and 2, the multiple connecting wiring sections 324 include seven connecting wiring sections 324.

The multiple connecting wiring parts 324 include, for example, a first connecting wiring part 324 (also referred to as a first connecting wiring part 3241) that connects multiple second string-like wiring parts 322 connected to one first solar cell 311. In the first embodiment, in the first region A1, the first connecting wiring part 3241 connects multiple second string-like wiring parts 322. Also, for example, each of the multiple second string-like wiring parts 322 includes a part (also referred to as a first bridging part) B1 that is bridged between the first solar cell 311 and the first connecting wiring part 3241. In other words, for example, the multiple second string-like wiring parts 322 include multiple first bridging parts B1.

The multiple connecting wiring parts 324 include, for example, a second connecting wiring part 324 (also referred to as a second connecting wiring part 3242) that connects multiple third string-like wiring parts 323 connected to one third solar cell 313. In the first embodiment, in the second region A2, the second connecting wiring part 3242 connects multiple third string-like wiring parts 323. Also, for example, each of the multiple third string-like wiring parts 323 includes a part (also referred to as a second bridge part) B2 that is bridged between the third solar cell 313 and the second connecting wiring part 3242. In other words, for example, the multiple third string-like wiring parts 323 include multiple second bridge parts B2.

In the first embodiment, the multiple connecting wiring parts 324 include multiple first connecting wiring parts 3241 and multiple second connecting wiring parts 3242. In the example of FIG. 1 and FIG. 2, the multiple first connecting wiring parts 3241 include three first connecting wiring parts 3241, and the multiple second connecting wiring parts 3242 include four second connecting wiring parts 3242.

1 and 2, the multiple first connecting wiring parts 3241 include a first connecting wiring part 3241 that connects a multiple number of second string-shaped wiring parts 322 connected to one first solar cell 311 between two adjacent solar cell strings 3s and a multiple number of second string-shaped wiring parts 322 connected to the other first solar cell 311. More specifically, the first first connecting wiring part 3241 connects a multiple number of second string-shaped wiring parts 322 connected to the first solar cell 311 of the first solar cell string 3s1 and a multiple number of second string-shaped wiring parts 322 connected to the first solar cell 311 of the second solar cell string 3s2. The second first connecting wiring part 3241 connects a multiple number of second string-shaped wiring parts 322 connected to the first solar cell 311 of the third solar cell string 3s3 and a multiple number of second string-shaped wiring parts 322 connected to the first solar cell 311 of the fourth solar cell string 3s4. The third first connecting wiring portion 3241 connects the multiple second string-like wiring portions 322 connected to the first solar cell 311 of the fifth solar cell string 3s5 and the multiple second string-like wiring portions 322 connected to the first solar cell 311 of the sixth solar cell string 3s6. The first connecting wiring portion 3241 is joined to the multiple second string-like wiring portions 322 by, for example, joining using a low-melting point alloy such as solder or a low-melting point simple metal.

1 and 2, the plurality of second connecting wiring parts 3242 includes a second connecting wiring part 3242 connecting a plurality of third string-shaped wiring parts 323 connected to one of the third solar cell cells 313 between two adjacent solar cell strings 3s and a plurality of third string-shaped wiring parts 323 connected to the other third solar cell cell 313. More specifically, the first second connecting wiring part 3242 connects a plurality of third string-shaped wiring parts 323 connected to the third solar cell cell 313 of the second solar cell string 3s2 and a plurality of third string-shaped wiring parts 323 connected to the third solar cell cell 313 of the third solar cell string 3s3. The second second connecting wiring part 3242 connects a plurality of third string-shaped wiring parts 323 connected to the third solar cell cell 313 of the fourth solar cell string 3s4 and a plurality of third string-shaped wiring parts 323 connected to the third solar cell cell 313 of the fifth solar cell string 3s5. The second connecting wiring portion 3242 is joined to the multiple third string-like wiring portions 323 by, for example, joining using a low-melting point alloy such as solder or a low-melting point simple metal. As a result, for example, the first solar cell string 3s1 to the sixth solar cell string 3s6 as the multiple solar cell strings 3s are electrically connected in series.

1 and 2, the plurality of second connection wiring parts 3242 connect the plurality of third string-shaped wiring parts 323 connected to the third solar cell 313 of the first solar cell string 3s1 at one end of the plurality of solar cell strings 3s, and include the second connection wiring part 3242 as a first output wiring part drawn out to the outside of the solar cell panel 101. The plurality of second connection wiring parts 3242 connect the plurality of third string-shaped wiring parts 323 connected to the third solar cell 313 of the sixth solar cell string 3s6 at the other end of the plurality of solar cell strings 3s, and include the second connection wiring part 3242 as a second output wiring part drawn out to the outside of the solar cell panel 101. As a result, for example, the power obtained by converting light energy into electrical energy in the plurality of solar cell cells 31 in the power generation unit 3 can be output to the outside of the solar cell panel 101. The first output wiring part and the second output wiring part are connected to terminals in a terminal box arranged on the back surface F2 of the solar cell panel 101, for example.

Each of the multiple connecting wiring parts 324 is, for example, a strip-shaped wiring material made of a conductive metal. The strip-shaped wiring material is, for example, a copper foil having a thickness of about 0.1 mm to 0.4 mm and a width of about 1 mm to 8 mm. This copper foil is used with its outer surface covered with, for example, a low-melting point alloy such as solder or a low-melting point simple metal.

<< Encapsulating material >>
The sealing material 4 is located between the first protective member 1 and the second protective member 2 in a state of covering the power generation unit 3. In other words, the sealing material 4 is located between the first protective member 1 and the second protective member 2 in a state of covering the multiple solar cells 31. From another perspective, the sealing material 4 is, for example, filled in the gap 101g between the first protective member 1 and the second protective member 2 while covering the power generation unit 3.

In the first embodiment, the sealing material 4 includes a sealing material (also referred to as a first sealing material) 41 located on the first protective member 1 side and a sealing material (also referred to as a second sealing material) 42 located on the second protective member 2 side. For example, the first sealing material 41 is located at least between the second surface 1s of the first protective member 1 and the power generation unit 3, and seals the power generation unit 3 from the first protective member 1 side. In other words, for example, the first sealing material 41 is located between the first protective member 1 and the multiple solar cell cells 31 and the multiple wiring units 32 in a state in which it covers the multiple solar cell cells 31 and the multiple wiring units 32. For example, the second sealing material 42 is located at least between the third surface 2t of the second protective member 2 and the power generation unit 3, and seals the power generation unit 3 from the second protective member 2 side. In other words, for example, the second sealing material 42 is positioned between the second protective member 2 and the solar cells 31 and wiring parts 32, covering the solar cells 31 and wiring parts 32. Therefore, in the first embodiment, the power generation unit 3 is surrounded by being sandwiched between the first sealing material 41 and the second sealing material 42. This allows the sealing material 4 to maintain the position of the power generation unit 3, for example.

The sealing material 4 also includes a third sealing material 43. The third sealing material 43 is an additional sealing material in the sealing material 4 that is added to the first sealing material 41 and the second sealing material 42. In the first embodiment, the sealing material 4 includes a plurality of third sealing materials 43. The plurality of third sealing materials 43 include a third A sealing material 43a and a third B sealing material 43b.

For example, the 3A sealing material 43a is located between the first sealing material 41 and a plurality of first bridge parts B1 that are bridged between the first solar cell 311 and the first connecting wiring part 3241. In FIG. 2, the outer edge of the 3A sealing material 43a is depicted by a two-dot chain line. In the example of FIG. 2, the 3A sealing material 43a is located between the first sealing material 41 and the plurality of first bridge parts B1 and all of the first connecting wiring parts 3241 that are bridged between all of the first solar cell 311 and the plurality of first connecting wiring parts 3241 in the power generation unit 3. All of the first solar cell cells 311 are composed of six first solar cell cells 311. The 3A sealing material 43a has, for example, a sheet-like shape having a longitudinal direction in the +X direction as the second direction. In the first embodiment, for example, as shown in FIG. 2, when viewed in plan from the front surface F1 side, the 3A sealing material 43a does not overlap the solar cell 31. In the example of FIG. 2, the external shape of the third A sealing material 43a is rectangular when viewed in plan from the front surface F1 side. The thickness of the third A sealing material 43a is, for example, about 0.1 mm to 0.5 mm.

For example, the third B sealing material 43b is located between the first sealing material 41 and a plurality of second bridge parts B2 that are bridged between the third solar cell 313 and the second connecting wiring part 3242. In FIG. 2, the outer edge of the third B sealing material 43b is depicted by a two-dot chain line. In the example of FIG. 2, the third B sealing material 43b is located between the first sealing material 41 and the plurality of second bridge parts B2 and all the second connecting wiring parts 3242 that are bridged between all the third solar cell 313 and the plurality of second connecting wiring parts 3242 in the power generation unit 3. All the third solar cell 313 is composed of six third solar cell 313. The third B sealing material 43b has, for example, a sheet-like shape having a longitudinal direction in the +X direction as the second direction. In the first embodiment, for example, as shown in FIG. 2, when viewed in plan from the front surface F1 side, the third B sealing material 43b does not overlap the solar cell 31. In the example of FIG. 2, the external shape of the third B sealing material 43b is rectangular when viewed in a plan view from the front surface F1 side. The thickness of the third B sealing material 43b is, for example, about 0.1 mm to 0.5 mm.

Here, the sealing material 4 has, for example, translucency similar to the first protective member 1. Here, the sealing material 4 has, for example, translucency for light in the specific range of wavelengths described above. Here, for example, of the first sealing material 41, the second sealing material 42, and the third sealing material 43 constituting the sealing material 4, if at least the first sealing material 41 has translucency, incident light from the front surface F1 side can reach the multiple solar cell cells 31.

A resin is applied to the material of the first sealing material 41, the second sealing material 42, and the third sealing material 43. For example, a non-crosslinked resin is applied to the material of the first sealing material 41 and the third sealing material 43. For example, either a crosslinked resin or a non-crosslinked resin may be applied to the material of the second sealing material 42. For example, a thermoplastic resin such as polyolefin elastomer (POE), ethylene vinyl acetate copolymer (EVA), polyvinyl acetal (PVA), or polyvinyl butyral (PVB) is used as the non-crosslinked resin. For example, EVA with a crosslinking agent added, PVA with a crosslinking agent added, or PVB with a crosslinking agent added is used as the crosslinked resin.

Here, for example, the melt mass flow rate (MFR) of the third sealing material 43 is smaller than the melt mass flow rate (MFR) of the first sealing material 41. The melt mass flow rate (MFR) of each of the first sealing material 41 and the third sealing material 43 is measured, for example, by a method conforming to JIS K7210 or ASTM D1238. Here, the measurement conditions of the melt mass flow rate (MFR) of each of the first sealing material 41 and the third sealing material 43 are set to the same measurement conditions. For example, the measurement conditions of the melt mass flow rate (MFR) are a temperature of 190 degrees Celsius (190°C) and a load of 2.16 kg.

For example, the softening temperature of the third sealing material 43 is equal to or higher than the softening temperature of the first sealing material 41. The Vicat softening temperature (VST) is applied to the softening temperatures of the first sealing material 41 and the third sealing material 43. The Vicat softening temperature (VST) of the first sealing material 41 and the third sealing material 43 is measured by a method conforming to JIS K7206 or ASTM D1525. Here, the test conditions for measuring the Vicat softening temperature (VST) of the first sealing material 41 and the third sealing material 43 are set to the same test conditions. For example, the test conditions may be any of the A50 method, the B50 method, the A120 method, and the B120 method.

The MFR and VST of the first sealing material 41 can be adjusted as appropriate, for example, by the amount of additives added. The MFR and VST of the third sealing material 43 can be adjusted as appropriate, for example, by the amount of additives added.

Here, for example, a case is assumed in which a solar cell panel 101 is manufactured by integrating a laminate in which the first protective member 1, the first resin material that becomes the first sealing material 41, the second resin material that becomes the third sealing material 43, the power generation unit 3, the third resin material that becomes the second sealing material 42, and the second protective member 2 are laminated, through a lamination process that involves heating, pressurization, and vacuum degassing. Here, for example, as described above, the third sealing material 43 has a melt mass flow rate (MFR) lower than that of the first sealing material 41, and a softening temperature equal to or higher than that of the first sealing material 41.

If such a configuration is adopted, for example, during lamination processing, the presence of the resin material that becomes the third A sealing material 43a makes it difficult for the first installation part B1 to approach the first protective member 1 in the resin in the molten state. As a result, for example, in the solar cell panel 101, the thickness of the sealing material 4 between the second string-shaped wiring part 322 and the first protective member 1 is unlikely to become thin. Also, for example, during lamination processing, the presence of the resin material that becomes the third B sealing material 43b makes it difficult for the second installation part B2 to approach the first protective member 1 in the resin in the molten state. As a result, for example, in the solar cell panel 101, the thickness of the sealing material 4 between the third string-shaped wiring part 323 and the first protective member 1 is unlikely to become thin. As a result, for example, the insulation withstand voltage in the solar cell module 100 is unlikely to decrease, and insulation deterioration of the first sealing material 41 is unlikely to occur. Therefore, for example, in the solar cell module 100, the first sealing material 41 is unlikely to peel off from the second surface 1s of the first protective member 1, and the sealing performance of the first sealing material 41 is unlikely to decrease, so that the solar cell 31 is unlikely to deteriorate due to water ingress. Therefore, for example, the solar cell module 100 is unlikely to deteriorate. Also, for example, if the first sealing material 41 has a high melt mass flow rate (MFR) and a low softening temperature, the solar cell 31 is unlikely to crack during lamination processing in the manufacture of the solar cell panel 101.

In addition, in the first embodiment, as described above, the third A sealing material 43a is located between the first sealing material 41 and the multiple first installation parts B1 installed between the first solar cell 311 and the first connecting wiring part 3241. This makes it easier to arrange the resin material that becomes the third A sealing material 43a on the multiple first installation parts B1 before lamination processing, for example, during the manufacture of the solar cell panel 101. As a result, for example, the solar cell module 100 can be easily manufactured.

In addition, in the first embodiment, as described above, the third B sealing material 43b is located between the first sealing material 41 and the multiple second bridge parts B2 that are bridged between the third solar cell 313 and the second connecting wiring part 3242. This makes it easier to arrange the resin material that becomes the third B sealing material 43b on the multiple second bridge parts B2 before lamination processing, for example, during the manufacture of the solar cell panel 101. As a result, for example, the solar cell module 100 can be easily manufactured.

Here, for example, when the third A sealing material 43a and the multiple first bridge parts B1 are viewed in a plane perpendicular to the first surface 1f, the width of the third A sealing material 43a may be greater than the width of each of the multiple first bridge parts B1. The width of the third A sealing material 43a is, for example, the length of the short side of the third A sealing material 43a when viewed in a plane. In other words, in the case of FIG. 2, the width of the third A sealing material 43a is the length of the third A sealing material 43a in the Y direction. The width of the first bridge part B1 is, for example, the line width of the second string-shaped wiring part 322. In other words, in the case of FIG. 2, the width of the first bridge part B1 is the length of the first bridge part B1 in the X direction. If such a configuration is adopted, for example, during the manufacturing of the solar cell panel 101, the presence of the resin material that becomes the third A sealing material 43a during lamination processing makes it difficult for the first installation part B1 to approach the first protective member 1 in the molten resin. As a result, for example, in the solar cell panel 101, the thickness of the sealing material 4 existing between the second string-shaped wiring part 322 and the first protective member 1 is unlikely to become thin. As a result, for example, the insulation withstand voltage of the solar cell module 100 is unlikely to decrease, and insulation deterioration of the first sealing material 41 is unlikely to occur. Therefore, for example, in the solar cell module 100, the first sealing material 41 is unlikely to peel off from the second surface 1s of the first protective member 1, and the sealing performance of the first sealing material 41 is unlikely to decrease, so deterioration of the solar cell 31 due to water infiltration is unlikely to occur. Therefore, for example, deterioration of the solar cell module 100 is unlikely to occur.

Here, for example, when the third-B sealing material 43b and the multiple second bridge parts B2 are viewed in a plane in a direction perpendicular to the first surface 1f, a configuration is considered in which the width of the third-B sealing material 43b is greater than the width of each of the multiple second bridge parts B2. For example, the length of the short side of the third-B sealing material 43b when viewed in a plane is applied to the width of the third-B sealing material 43b. In other words, in the case of FIG. 2, the length of the third-B sealing material 43b in the Y direction is applied to the width of the third-B sealing material 43b. For example, the line width of the third string-shaped wiring part 323 is applied to the width of the second bridge part B2. In other words, in the case of FIG. 2, the length of the second bridge part B2 in the X direction is applied to the width of the second bridge part B2. If such a configuration is adopted, for example, during the manufacturing of the solar cell panel 101, the second installation part B2 is unlikely to approach the first protective member 1 in the molten resin during lamination processing due to the presence of the resin material that becomes the third B sealing material 43b. As a result, for example, in the solar cell panel 101, the thickness of the sealing material 4 existing between the third string-shaped wiring part 323 and the first protective member 1 is unlikely to become thin. As a result, for example, the insulation withstand voltage of the solar cell module 100 is unlikely to decrease, and insulation deterioration of the first sealing material 41 is unlikely to occur. Therefore, for example, in the solar cell module 100, the first sealing material 41 is unlikely to peel off from the second surface 1s of the first protective member 1, and the sealing performance of the first sealing material 41 is unlikely to decrease, so deterioration of the solar cell 31 due to water infiltration is unlikely to occur. Therefore, for example, deterioration of the solar cell module 100 is unlikely to occur.

<1-2. Manufacturing of solar cell modules>
An example of a method for manufacturing the solar cell module 100 will be described with reference to Fig. 12 to Fig. 17. As shown in Fig. 12, the method for manufacturing the solar cell module 100 according to the first embodiment includes, for example, a process of step S1 (also referred to as a preparation process), a process of step S2 (also referred to as a lamination process), and a process of step S3 (also referred to as a lamination process).

<<Step S1 (Preparation Process)>>
13, a first protective member 1, a sheet-shaped first resin material 941, a sheet-shaped second resin material 943, a sheet-shaped third resin material 942, a second protective member 2, and a power generation unit 3 are prepared. In the first embodiment, two sheet-shaped second resin materials 943 are prepared. The two sheet-shaped second resin materials 943 include a sheet-shaped secondA resin material 943a and a sheet-shaped secondB resin material 943b.

The first protective member 1 is, for example, a plate-like member having translucency, as described above. The sheet-like first resin material 941 is a resin material that becomes the first sealing material 41 by the lamination process of step S3. The sheet-like second resin material 943 is a resin material that becomes the third sealing material 43 by the lamination process of step S3. The sheet-like second A resin material 943a is a resin material that becomes the third A sealing material 43a by the lamination process of step S3. The sheet-like second B resin material 943b is a resin material that becomes the third B sealing material 43b by the lamination process of step S3. The sheet-like third resin material 942 is a resin material that becomes the second sealing material 42 by the lamination process of step S3. The power generation unit 3 includes a plurality of solar cell cells 31, as described above.

Here, resins are applied to the materials of the first resin material 941, the second resin material 943, and the third resin material 942. In the first embodiment, for example, a non-crosslinked resin is applied to the materials of the first resin material 941 and the second resin material 943. For example, either a crosslinked resin or a non-crosslinked resin may be applied to the material of the third resin material 942. For example, thermoplastic resins such as polyolefin elastomer (POE), ethylene vinyl acetate copolymer (EVA), polyvinyl acetal (PVA), or polyvinyl butyral (PVB) are used as the non-crosslinked resin. For example, EVA with a crosslinking agent added, PVA with a crosslinking agent added, or PVB with a crosslinking agent added are used as the crosslinked resin.

<<Step S2 (Lamination Process)>>
14 to 16, the first protective member 1, the first resin material 941, the second resin material 943, the power generation unit 3, the third resin material 942, and the second protective member 2 are laminated in the order shown to generate a laminated body 901. In other words, the laminated body 901 is generated by laminating the first protective member 1, the first resin material 941, the second resin material 943, the power generation unit 3, the third resin material 942, and the second protective member 2 in the order shown.

Figure 17 shows a schematic diagram of the positional relationship between the first protective member 1, the first resin material 941, the second resin material 943, and the power generation unit 3, which are stacked together. For convenience, the third resin material 942 and the second protective member 2 are omitted from the illustration in Figure 17.

As shown in Figs. 14 to 17, the power generation unit 3 includes, for example, a plurality of solar cells 31 and a plurality of wiring parts 32. The plurality of solar cells 31 includes, for example, two or more solar cells 31 arranged in a first direction (for example, the -Y direction). In the first embodiment, the plurality of solar cells 31 are arranged two-dimensionally. In the examples of Figs. 14 to 17, the plurality of solar cells 31 are positioned in a planar arrangement along a virtual plane (also called a virtual plane) parallel to the XY plane. The plurality of solar cells 31 includes two or more solar cells 31 arranged in a +X direction as a second direction intersecting the first direction. More specifically, for example, the plurality of solar cells 31 includes N columns (N is a natural number equal to or greater than 2) of solar cells 31, each of which includes M solar cells 31 (M is a natural number equal to or greater than 2). In the examples of Figs. 14 to 17, M is 3 and N is 6. In other words, the plurality of solar cells 31 are arranged in a matrix of M rows and N columns.

The power generation unit 3 also includes a solar cell string 3s. In the first embodiment, the power generation unit 3 includes a plurality of solar cell strings 3s. In the examples of Figs. 14 to 17, the plurality of solar cell strings 3s includes six solar cell strings 3s. The six solar cell strings 3s include a first solar cell string 3s1, a second solar cell string 3s2, a third solar cell string 3s3, a fourth solar cell string 3s4, a fifth solar cell string 3s5, and a sixth solar cell string 3s6. The first solar cell string 3s1, the second solar cell string 3s2, the third solar cell string 3s3, the fourth solar cell string 3s4, the fifth solar cell string 3s5, and the sixth solar cell string 3s6 are arranged in the +X direction as the second direction in the order described here. Each of the plurality of solar cell strings 3s has a similar configuration. In the examples of Figs. 14 to 17, two adjacent solar cell strings 3s have a configuration that is rotationally symmetrical with respect to a virtual axis parallel to the Z axis.

For example, each of the multiple solar cell strings 3s includes two or more solar cell cells 31 arranged in the -Y direction as the first direction, multiple first string-like wiring portions 321, and multiple second string-like wiring portions 322. Also, for example, the solar cell string 3s includes multiple third string-like wiring portions 323. In other words, the multiple wiring portions 32 in the power generation unit 3 include multiple first string-like wiring portions 321, multiple second string-like wiring portions 322, and multiple third string-like wiring portions 323.

In the examples of Figures 14 to 17, each of the multiple solar cell strings 3s has three solar cell cells 31 as the two or more solar cell cells 31. The three solar cell cells 31 include a first solar cell 311, a second solar cell 312, and a third solar cell 313. The first solar cell 311, the second solar cell 312, and the third solar cell 313 are arranged in the order described in the +Y direction. In other words, for example, the two or more solar cell cells 31 constituting the solar cell string 3s include a first solar cell 311 located at the end of the -Y direction as the first direction. For example, the two or more solar cell cells 31 constituting the solar cell string 3s include a third solar cell 313 located at the end of the +Y direction as the third direction opposite to the first direction.

The multiple first string-like wiring parts 321 electrically connect two or more solar cells 31 in the solar cell string 3s. Here, each of the multiple first string-like wiring parts 321 electrically connects two or more solar cells 31 that are adjacent to each other among the two or more solar cells 31.

Each of the multiple second string-like wiring parts 322 is electrically connected to a first solar cell 311 located at the end of the -Y direction as the first direction among two or more solar cells 31 in the solar cell string 3s. In the example of Figures 14 to 17, six second string-like wiring parts 322 are joined to one first solar cell 311. In addition, each of the multiple second string-like wiring parts 322 extends to a region (also called a third region) A3 located in the -Y direction as the first direction from the first solar cell 311. In the example of Figures 14 to 17, each of the multiple second string-like wiring parts 322 extends in the -Y direction as the first direction in the third region A3.

Each of the multiple third string-like wiring parts 323 is electrically connected to a third solar cell 313 located at the end of the two or more solar cells 31 in the solar cell string 3s in the +Y direction as a third direction opposite to the first direction. In the example of Figures 14 to 17, six third string-like wiring parts 323 are joined to one third solar cell 313. Each of the multiple third string-like wiring parts 323 extends to a region (also called a fourth region) A4 located in the +Y direction as the third direction from the third solar cell 313. In the example of Figures 14 to 17, each of the multiple third string-like wiring parts 323 extends in the +Y direction as the third direction in the fourth region A4.

Each of the first string-like wiring portion 321, the second string-like wiring portion 322, and the third string-like wiring portion 323 is, for example, a conductive metal wire. For example, a copper wire with a cross-sectional diameter of about 0.1 mm to 0.5 mm is used as the wire. This copper wire is used with its outer surface coated with, for example, a low-melting-point alloy such as solder or a low-melting-point simple metal.

The multiple wiring sections 32 in the power generation unit 3 include multiple connecting wiring sections 324. In the example of Figures 14 to 17, the multiple connecting wiring sections 324 include seven connecting wiring sections 324.

The multiple connecting wiring parts 324 include, for example, a first connecting wiring part 3241 that connects multiple second string-like wiring parts 322 connected to one first solar cell 311. In the first embodiment, in the third region A3, the first connecting wiring part 3241 connects multiple second string-like wiring parts 322. Also, for example, each of the multiple second string-like wiring parts 322 includes a first bridging part B1 that is bridged between the first solar cell 311 and the first connecting wiring part 3241. In other words, for example, the multiple second string-like wiring parts 322 include multiple first bridging parts B1.

The multiple connecting wiring parts 324 include, for example, a second connecting wiring part 3242 that connects multiple third string-like wiring parts 323 connected to one third solar cell 313. In the first embodiment, in the fourth region A4, the second connecting wiring part 3242 connects multiple third string-like wiring parts 323. Also, for example, each of the multiple third string-like wiring parts 323 includes a second bridge part B2 that is bridged between the third solar cell 313 and the second connecting wiring part 3242. In other words, for example, the multiple third string-like wiring parts 323 include multiple second bridge parts B2.

In the first embodiment, the multiple connecting wiring parts 324 include multiple first connecting wiring parts 3241 and multiple second connecting wiring parts 3242. In the examples of Figures 14 and 17, the multiple first connecting wiring parts 3241 include three first connecting wiring parts 3241, and the multiple second connecting wiring parts 3242 include four second connecting wiring parts 3242.

In the examples of FIG. 14 to FIG. 17, the multiple first connecting wiring parts 3241 include a first connecting wiring part 3241 that connects a multiple number of second string-shaped wiring parts 322 connected to one first solar cell 311 between two adjacent solar cell strings 3s and a multiple number of second string-shaped wiring parts 322 connected to the other first solar cell 311. More specifically, the first first connecting wiring part 3241 connects a multiple number of second string-shaped wiring parts 322 connected to the first solar cell 311 of the first solar cell string 3s1 and a multiple number of second string-shaped wiring parts 322 connected to the first solar cell 311 of the second solar cell string 3s2. The second first connecting wiring part 3241 connects a multiple number of second string-shaped wiring parts 322 connected to the first solar cell 311 of the third solar cell string 3s3 and a multiple number of second string-shaped wiring parts 322 connected to the first solar cell 311 of the fourth solar cell string 3s4. The third first connecting wiring portion 3241 connects the multiple second string-like wiring portions 322 connected to the first solar cell 311 of the fifth solar cell string 3s5 and the multiple second string-like wiring portions 322 connected to the first solar cell 311 of the sixth solar cell string 3s6. The first connecting wiring portion 3241 is joined to the multiple second string-like wiring portions 322 by, for example, joining using a low-melting point alloy such as solder or a low-melting point simple metal.

In the examples of FIG. 14 to FIG. 17, the plurality of second connecting wiring parts 3242 includes a second connecting wiring part 3242 that connects a plurality of third string-shaped wiring parts 323 connected to one of the third solar cell cells 313 between two adjacent solar cell strings 3s and a plurality of third string-shaped wiring parts 323 connected to the other third solar cell cell 313. More specifically, the first second connecting wiring part 3242 connects a plurality of third string-shaped wiring parts 323 connected to the third solar cell cell 313 of the second solar cell string 3s2 and a plurality of third string-shaped wiring parts 323 connected to the third solar cell cell 313 of the third solar cell string 3s3. The second second connecting wiring part 3242 connects a plurality of third string-shaped wiring parts 323 connected to the third solar cell cell 313 of the fourth solar cell string 3s4 and a plurality of third string-shaped wiring parts 323 connected to the third solar cell cell 313 of the fifth solar cell string 3s5. The second connecting wiring portion 3242 is joined to the multiple third string-like wiring portions 323 by, for example, joining using a low-melting point alloy such as solder or a low-melting point simple metal. As a result, for example, the first solar cell string 3s1 to the sixth solar cell string 3s6 as the multiple solar cell strings 3s are electrically connected in series.

In the examples of Figures 14 to 17, the multiple second connecting wiring parts 3242 include a second connecting wiring part 3242 as a first output wiring part that connects multiple third string-like wiring parts 323 connected to the third solar cell 313 of the first solar cell string 3s1 at one end of the multiple solar cell strings 3s. The multiple second connecting wiring parts 3242 include a second connecting wiring part 3242 as a second output wiring part that connects multiple third string-like wiring parts 323 connected to the third solar cell 313 of the sixth solar cell string 3s6 at the other end of the multiple solar cell strings 3s.

Each of the multiple connecting wiring parts 324 is, for example, a strip-shaped wiring material made of a conductive metal. The strip-shaped wiring material is, for example, a copper foil having a thickness of about 0.1 mm to 0.4 mm and a width of about 1 mm to 8 mm. This copper foil is used with its outer surface covered with, for example, a low-melting point alloy such as solder or a low-melting point simple metal.

In the first embodiment, as shown in FIG. 14, FIG. 15 and FIG. 17, in the lamination process of step S2, the second A resin material 943a is placed between the first resin material 941 and the plurality of first bridge parts B1. In FIG. 17, the second A resin material 943a is hatched using sand. In the examples of FIG. 14, FIG. 15 and FIG. 17, the second A resin material 943a is placed between the first bridge parts B1 and all the first connection wiring parts 3241 and the first resin material 941, which are bridged between all the first solar cell cells 311 and the plurality of first connection wiring parts 3241 in the power generation unit 3. In the example of FIG. 17, all the first solar cell cells 311 are composed of six first solar cell cells 311. In the first embodiment, for example, as shown in FIG. 17, the second A resin material 943a is placed so as not to overlap the solar cell 31 in a plan view. The second A resin material 943a has, for example, a sheet shape with its longitudinal direction in the +X direction as the second direction. In the example of FIG. 17, the outer shape of the second A resin material 943a is rectangular when viewed in a plan view. The thickness of the second A resin material 943a is, for example, about 0.1 mm to 0.5 mm.

In the first embodiment, as shown in FIG. 14, FIG. 16, and FIG. 17, in the lamination process of step S2, the second B resin material 943b is placed between the first resin material 941 and the plurality of second bridge parts B2. In FIG. 17, the second B resin material 943b is hatched using sand. In the examples of FIG. 14, FIG. 16, and FIG. 17, the second B resin material 943b is placed between the plurality of second bridge parts B2 and all of the second connection wiring parts 3242 that are bridged between all of the third solar cell 313 and the plurality of second connection wiring parts 3242 in the power generation unit 3, and the first resin material 941. In the example of FIG. 17, all of the third solar cell 313 are composed of six third solar cell 313. In the first embodiment, for example, as shown in FIG. 17, the second B resin material 943b is placed so as not to overlap the solar cell 31 in a plan view. The second B resin material 943b has, for example, a sheet shape with its longitudinal direction in the +X direction as the second direction. In the example of FIG. 17, the outer shape of the second B resin material 943b is rectangular when viewed in a plan view. The thickness of the second B resin material 943b is, for example, about 0.1 mm to 0.5 mm.

<<Step S3 (Lamination Process)>>
In step S3, the laminate 901 is subjected to a lamination process to generate the solar cell panel 101. Here, for example, a laminator is used to integrate the laminate 901. For example, in the laminator, the laminate 901 is placed on a heater plate in a chamber, and the laminate 901 is heated to about 100 degrees Celsius (100° C.) to 200 degrees Celsius (200° C.) while reducing the pressure in the chamber from about 50 Pascals (Pa) to about 150 Pa. In other words, for example, the laminate 901 is heated to a temperature exceeding the softening temperatures of the first resin material 941, the second resin material 943, and the third resin material 942. For example, the Vicat softening temperature (VST) is applied to the softening temperatures of the first resin material 941, the second resin material 943, and the third resin material 942. At this time, the first resin material 941, the second resin material 943, and the third resin material 942 become fluid to some extent due to heating. In this state, the laminate 901 is pressed with a diaphragm sheet or the like in the chamber to integrate the laminate 901. In this way, for example, the solar cell panel 101 shown in Figures 2, 3, 10, and 11 can be formed.

Here, when the laminate 901 is heated to a temperature exceeding the softening temperature of each of the first resin material 941, the second resin material 943, and the third resin material 942, a configuration is adopted in which the melt mass flow rate (MFR) of the second resin material 943 is smaller than the melt mass flow rate (MFR) of the first resin material 941. The melt mass flow rate (MFR) of the first resin material 941 and the melt mass flow rate (MFR) of the second resin material 943 in the lamination process can be measured, for example, by a method conforming to JIS K7210 or ASTM D1238. Here, the measurement conditions for the melt mass flow rates (MFR) of the first resin material 941 and the second resin material 943 are set to the same measurement conditions. The conditions for measuring the melt mass flow rate (MFR) are, for example, that the temperature is the heating temperature of the lamination process and the load is a predetermined value (e.g., 2.16 kg).

If such a configuration is adopted, for example, during lamination processing, the presence of the second A resin material 943a makes it difficult for the first installation part B1 to approach the first protective member 1 in the resin in a molten state. As a result, for example, in the solar cell panel 101, the thickness of the sealing material 4 existing between the second string-shaped wiring part 322 and the first protective member 1 is unlikely to become thin. Also, for example, during lamination processing, the presence of the second B resin material 943b makes it difficult for the second installation part B2 to approach the first protective member 1 in the resin in a molten state. As a result, for example, in the solar cell panel 101, the thickness of the sealing material 4 existing between the third string-shaped wiring part 323 and the first protective member 1 is unlikely to become thin. As a result, for example, in the solar cell module 100, the insulation withstand voltage is unlikely to decrease, and insulation deterioration of the first sealing material 41 is unlikely to occur. Therefore, for example, in the solar cell module 100, the first sealing material 41 is unlikely to peel off from the second surface 1s of the first protective member 1 due to insulation deterioration, and the sealing performance of the first sealing material 41 is unlikely to decrease, so deterioration of the solar cell 31 due to water seepage between the peeled layers is unlikely to occur. Therefore, for example, deterioration of the solar cell module 100 is unlikely to occur.

Here, for example, in the lamination process of step S2, if the softening temperature of the second resin material 943 is equal to or higher than the softening temperature of the first resin material 941, even though the melt mass flow rate (MFR) of the second resin material 943 is smaller than the melt mass flow rate (MFR) of the first resin material 941 during lamination processing, the first resin material 941 tends to soften and flow early, so the mechanical load on the solar cell 31 can be reduced and the solar cell 31 is less likely to crack. In other words, the effect of reduced yield caused by the second resin material 943 being harder than the first resin material 941 can be reduced.

In the first embodiment, as described above, for example, in the lamination process of step S2, the second A resin material 943a is disposed between the first resin material 941 and a plurality of first bridge parts B1 that are bridged between the first solar cell 311 and the first connecting wiring part 3241. This makes it possible, for example, to easily dispose the second A resin material 943a that becomes the third A sealing material 43a on a large number of first bridge parts B1 when manufacturing the solar cell panel 101. As a result, for example, the solar cell module 100 can be easily manufactured.

In the first embodiment, as described above, for example, in the lamination process of step S2, the second B resin material 943b is disposed between the first resin material 941 and a plurality of second bridge parts B2 that are bridged between the third solar cell 313 and the second connecting wiring part 3242. This makes it possible, for example, to easily dispose the second B resin material 943b that becomes the third B sealing material 43b on the multiple second bridge parts B2 when manufacturing the solar cell panel 101. As a result, for example, the solar cell module 100 can be easily manufactured.

Here, in the lamination process of step S2, for example, when the second A resin material 943a and the multiple first bridge parts B1 are viewed in a plane, a configuration is considered in which the width of the second A resin material 943a is larger than the width of each of the multiple first bridge parts B1. For example, the length of the short side of the second A resin material 943a when viewed in a plane is applied to the width of the second A resin material 943a. In other words, in the case of FIG. 17, the length of the second A resin material 943a in the Y direction is applied to the width of the second A resin material 943a. For example, the line width of the second string-like wiring part 322 is applied to the width of the first bridge part B1. In other words, in the case of FIG. 17, the length of the first bridge part B1 in the X direction is applied to the width of the first bridge part B1. If such a configuration is adopted, for example, during lamination processing, the presence of the second A resin material 943a that becomes the third A sealing material 43a makes it difficult for the first installation part B1 to approach the first protective member 1 in the molten resin. As a result, for example, in the solar cell panel 101, the thickness of the sealing material 4 existing between the second string-shaped wiring part 322 and the first protective member 1 is unlikely to become thin. As a result, for example, the insulation withstand voltage in the solar cell module 100 is unlikely to decrease, and insulation deterioration of the first sealing material 41 is unlikely to occur. Therefore, for example, in the solar cell module 100, the first sealing material 41 is unlikely to peel off from the second surface 1s of the first protective member 1, and the sealing performance of the first sealing material 41 is unlikely to decrease, so deterioration of the solar cell 31 due to water infiltration is unlikely to occur. Therefore, for example, deterioration of the solar cell module 100 is unlikely to occur.

Here, in the lamination process of step S2, for example, when the second B resin material 943b and the multiple second bridge parts B2 are viewed in a plane, a configuration is considered in which the width of the second B resin material 943b is larger than the width of each of the multiple second bridge parts B2. For example, the length of the short side of the second B resin material 943b when viewed in a plane is applied to the width of the second B resin material 943b. In other words, in the case of FIG. 17, the length of the second B resin material 943b in the Y direction is applied to the width of the second B resin material 943b. For example, the line width of the third string-like wiring part 323 is applied to the width of the second bridge part B2. In other words, in the case of FIG. 17, the length of the second bridge part B2 in the X direction is applied to the width of the second bridge part B2. If such a configuration is adopted, for example, during lamination processing, the second bridge portion B2 is unlikely to approach the first protective member 1 in the molten resin due to the presence of the second B resin material 943b that becomes the third B sealing material 43b. As a result, for example, in the solar cell panel 101, the thickness of the sealing material 4 existing between the third string-shaped wiring portion 323 and the first protective member 1 is unlikely to become thin. As a result, for example, the insulation withstand voltage in the solar cell module 100 is unlikely to decrease, and insulation deterioration of the first sealing material 41 is unlikely to occur. Therefore, for example, in the solar cell module 100, the first sealing material 41 is unlikely to peel off from the second surface 1s of the first protective member 1, and the sealing performance of the first sealing material 41 is unlikely to decrease, so deterioration of the solar cell 31 due to water infiltration is unlikely to occur. Therefore, for example, deterioration of the solar cell module 100 is unlikely to occur.

<1-3. Summary of the first embodiment>
In the solar cell module 100 according to the first embodiment, for example, the third A sealing material 43a is located between a plurality of first bridge parts B1 bridged between the first solar cell 311 and the first connecting wiring part 3241, and the first sealing material 41. For example, the melt mass flow rate (MFR) of the third A sealing material 43a is smaller than the melt mass flow rate (MFR) of the first sealing material 41, and the softening temperature of the third A sealing material 43a is equal to or higher than the softening temperature of the first sealing material 41. For this reason, for example, during lamination processing in the manufacture of the solar cell panel 101, the presence of the resin material that becomes the third A sealing material 43a makes it difficult for the first bridge part B1 to approach the first protective member 1 in the molten resin. As a result, for example, in the solar cell panel 101, the thickness of the sealing material 4 present between the second string-shaped wiring part 322 and the first protective member 1 is unlikely to become thin. As a result, for example, the insulation withstand voltage of the solar cell module 100 is unlikely to decrease, and insulation deterioration of the first sealing material 41 is unlikely to occur. Therefore, for example, in the solar cell module 100, the first sealing material 41 is unlikely to peel off from the second surface 1s of the first protective member 1, and the sealing performance of the first sealing material 41 is unlikely to decrease, so that deterioration of the solar cell 31 due to water infiltration or the like is unlikely to occur. Therefore, for example, deterioration of the solar cell module 100 is unlikely to occur. In addition, for example, since the first sealing material 41 has a high melt mass-flow rate (MFR) and a low softening temperature, the solar cell 31 is unlikely to crack during lamination processing in manufacturing the solar cell panel 101.

In addition, in the manufacturing method of the solar cell module 100 according to the first embodiment, the first protective member 1, the first resin material 941, the second resin material 943, the power generating unit 3, the third resin material 942, and the second protective member 2 are laminated to produce a laminate 901, to produce a solar cell panel 101. Here, for example, when producing the laminate 901, the second A resin material 943a is placed between the first resin material 941 and the multiple first installation parts B1. Then, for example, when the laminate 901 is heated to a temperature exceeding the softening temperatures of the first resin material 941, the second A resin material 943a, and the third resin material 942, the melt mass flow rate (MFR) of the second A resin material 943a is smaller than the melt mass flow rate (MFR) of the first resin material 941. Therefore, for example, during lamination processing, the presence of the second A resin material 943a makes it difficult for the first installation part B1 to approach the first protective member 1 in the molten resin. As a result, for example, in the solar cell panel 101, the thickness of the sealing material 4 present between the second string-shaped wiring part 322 and the first protective member 1 is unlikely to become thin. As a result, for example, in the solar cell module 100, the insulation withstand voltage is unlikely to decrease, and insulation deterioration of the first sealing material 41 is unlikely to occur. Therefore, for example, in the solar cell module 100, the first sealing material 41 is unlikely to peel off from the second surface 1s of the first protective member 1, and the sealing performance of the first sealing material 41 is unlikely to decrease, so deterioration of the solar cell 31 due to water infiltration is unlikely to occur. Therefore, for example, deterioration of the solar cell module 100 is unlikely to occur.

2. Other embodiments
The present disclosure is not limited to the first embodiment described above, and various modifications and improvements are possible without departing from the gist of the present disclosure.

<2-1. First modified example>
In the first embodiment, for example, the third A sealing material 43a may be located between any number of first bridging parts B1, which are two or more of the plurality of first bridging parts B1 that are bridged between all the first solar cell 311 and the plurality of first connecting wiring parts 3241 in the power generating unit 3, and the first sealing material 41. From another viewpoint, for example, the third A sealing material 43a may be located between two or more first bridging parts B1 that are bridged between one first solar cell 311 and the first connecting wiring part 3241, and the first sealing material 41. Specifically, for example, as shown in FIG. 18, a mode in which the third A sealing material 43a is located between the two first bridging parts B1 and the first sealing material 41 for each of the two first bridging parts B1 is considered. In FIG. 18, the outer edges of each of the plurality of third A sealing materials 43a are depicted by two-dot chain lines.

In this case, for example, in the lamination process of step S2, the second A resin material 943a may be disposed between the first resin material 941 and any number of first bridge parts B1, which are two or more of the multiple first bridge parts B1 that are bridged between all the first solar cell 311 and the multiple first connecting wiring parts 3241 in the power generation unit 3. From another perspective, for example, in the lamination process of step S2, the second A resin material 943a may be disposed between the first resin material 941 and two or more of the multiple first bridge parts B1 that are bridged between one first solar cell 311 and the first connecting wiring part 3241. Specifically, for example, as shown in FIG. 19, a mode in which the second A resin material 943a is disposed between the first resin material 941 and the two first bridge parts B1 for each of the two first bridge parts B1 is considered. FIG. 19 shows a schematic diagram of the positional relationship between the first protective member 1, the first resin material 941, the second resin material 943, and the power generation section 3, which are layered together. For convenience, the third resin material 942 and the second protective member 2 are omitted from the illustration in FIG. 19.

Even if such a configuration is adopted, for example, when manufacturing the solar cell panel 101, the second A resin material 943a that becomes the third A sealing material 43a can be easily arranged on two or more first mounting parts B1. This makes it possible to easily manufacture, for example, the solar cell module 100.

For example, the third B sealing material 43b may be located between any number of the second bridge parts B2 (two or more) of the second bridge parts B2 that are bridged between all the third solar cell 313 in the power generating unit 3 and the second connecting wiring parts 3242, and the first sealing material 41. From another perspective, for example, the third B sealing material 43b may be located between two or more second bridge parts B2 of the second bridge parts B2 that are bridged between one third solar cell 313 and the second connecting wiring part 3242, and the first sealing material 41. Specifically, for example, as shown in FIG. 18, a third B sealing material 43b may be located between the two second bridge parts B2 and the first sealing material 41 for each of the two second bridge parts B2. In FIG. 18, the outer edges of each of the multiple third B sealing materials 43b are depicted by two-dot chain lines.

In this case, for example, in the lamination process of step S2, the second B resin material 943b may be disposed between the first resin material 941 and any number of the second bridge parts B2, which are two or more of the multiple second bridge parts B2 that are bridged between all the third solar cell 313 in the power generation unit 3 and the multiple second connection wiring parts 3242. From another perspective, for example, in the lamination process of step S2, the second B resin material 943b may be disposed between the first resin material 941 and two or more of the multiple second bridge parts B2 that are bridged between one third solar cell 313 and the second connection wiring part 3242. Specifically, for example, as shown in FIG. 19, a mode in which the second B resin material 943b is disposed between the first resin material 941 and the two second bridge parts B2 for each of the two second bridge parts B2 is considered.

Even if such a configuration is adopted, for example, when manufacturing the solar cell panel 101, the second B resin material 943b that becomes the third B sealing material 43b can be easily arranged on two or more second mounting parts B2. This makes it possible to easily manufacture, for example, the solar cell module 100.

<2-2. Second Modified Example>
In the first embodiment, for example, the third A sealing material 43a may be located between any number of first bridging parts B1 (one or more) of the first bridging parts B1 bridged between all the first solar cells 311 and the first connecting wiring parts 3241 in the power generating unit 3 and the first sealing material 41. From another perspective, for example, the third A sealing material 43a may be located between one or more first bridging parts B1 of the first bridging parts B1 bridged between one first solar cell 311 and the first connecting wiring part 3241 and the first sealing material 41. Specifically, for example, as shown in FIG. 20, a third A sealing material 43a may be located between one first bridging part B1 and the first sealing material 41 for each first bridging part B1. In FIG. 20, the outer edges of the plurality of third A sealing materials 43a are depicted by two-dot chain lines.

In this case, for example, in the lamination process of step S2, the second A resin material 943a may be disposed between the first resin material 941 and any number of the first bridge parts B1, which are one or more of the multiple first bridge parts B1 that are bridged between all the first solar cell 311 and the multiple first connection wiring parts 3241 in the power generation unit 3. From another perspective, for example, in the lamination process of step S2, the second A resin material 943a may be disposed between the first resin material 941 and one or more of the multiple first bridge parts B1 that are bridged between one first solar cell 311 and the first connection wiring part 3241. Specifically, for example, as shown in FIG. 21, a mode in which the second A resin material 943a is disposed between the first resin material 941 and one first bridge part B1 for each first bridge part B1 is considered. FIG. 21 shows a schematic diagram of the positional relationship between the first protective member 1, the first resin material 941, the second resin material 943, and the power generation section 3, which are layered together. For convenience, the third resin material 942 and the second protective member 2 are omitted from the illustration in FIG. 21.

Even if such a configuration is adopted, for example, during lamination processing, the presence of the second A resin material 943a that becomes the third A sealing material 43a makes it difficult for the first installation part B1 to approach the first protective member 1 in the molten resin. As a result, for example, in the solar cell panel 101, the thickness of the sealing material 4 existing between the second string-shaped wiring part 322 and the first protective member 1 is unlikely to become thin. As a result, for example, the insulation withstand voltage in the solar cell module 100 is unlikely to decrease, and insulation deterioration of the first sealing material 41 is unlikely to occur. Therefore, for example, in the solar cell module 100, the first sealing material 41 is unlikely to peel off from the second surface 1s of the first protective member 1, and the sealing performance of the first sealing material 41 is unlikely to decrease, so deterioration of the solar cell 31 due to water infiltration, etc. is unlikely to occur. Therefore, for example, deterioration of the solar cell module 100 is unlikely to occur.

For example, the third B sealing material 43b may be located between any number of second bridge parts B2 (one or more) of the plurality of second bridge parts B2 that are bridged between all the third solar cell 313 in the power generating unit 3 and the plurality of second connecting wiring parts 3242, and the first sealing material 41. From another perspective, for example, the third B sealing material 43b may be located between one or more second bridge parts B2 of the plurality of second bridge parts B2 that are bridged between one third solar cell 313 and the second connecting wiring part 3242, and the first sealing material 41. Specifically, for example, as shown in FIG. 20, a third B sealing material 43b may be located between one second bridge part B2 and the first sealing material 41 for each second bridge part B2. In FIG. 20, the outer edges of each of the plurality of third B sealing materials 43b are depicted by two-dot chain lines.

In this case, for example, in the lamination process of step S2, the second B resin material 943b may be disposed between the first resin material 941 and any number of the second bridge parts B2, which are one or more of the multiple second bridge parts B2 that are bridged between all the third solar cell 313 in the power generation unit 3 and the multiple second connection wiring parts 3242. From another perspective, for example, in the lamination process of step S2, the second B resin material 943b may be disposed between the first resin material 941 and one or more of the multiple second bridge parts B2 that are bridged between one third solar cell 313 and the second connection wiring part 3242. Specifically, for example, as shown in FIG. 21, a mode in which the second B resin material 943b is disposed between the first resin material 941 and one second bridge part B2 for each second bridge part B2 is conceivable.

Even if such a configuration is adopted, for example, during lamination processing, the presence of the second B resin material 943b that becomes the third B sealing material 43b makes it difficult for the second installation part B2 to approach the first protective member 1 in the molten resin. As a result, for example, in the solar cell panel 101, the thickness of the sealing material 4 existing between the third string-shaped wiring part 323 and the first protective member 1 is unlikely to become thin. As a result, for example, the insulation withstand voltage in the solar cell module 100 is unlikely to decrease, and insulation deterioration of the first sealing material 41 is unlikely to occur. Therefore, for example, in the solar cell module 100, the first sealing material 41 is unlikely to peel off from the second surface 1s of the first protective member 1, and the sealing performance of the first sealing material 41 is unlikely to decrease, so deterioration of the solar cell 31 due to water infiltration, etc. is unlikely to occur. Therefore, for example, deterioration of the solar cell module 100 is unlikely to occur.

<2-3. Third Modified Example>
22 , in the first embodiment and each of the modified examples, the third-A sealing material 43a may be located between a region (also referred to as an approach region) A11 of the first bridging portion B1 bridged between the first solar cell 311 and the first connecting wiring portion 3241, which is closer to the first protective member 1 than the plurality of solar cells 31, and the first sealing material 41. In other words, for example, one or more first bridging portions B1 bridged between the first solar cell 311 and the first connecting wiring portion 3241 may include, between the third-A sealing material 43a and the second sealing material 42, an approach region A11 closer to the first protective member 1 than the plurality of solar cells 31. In this case, for example, during lamination processing, even if the first resin material 941 that becomes the first sealing material 41 becomes highly fluid in a molten state, the presence of the second A resin material 943a that becomes the third A sealing material 43a makes it difficult for the first installation part B1 to approach the first protective member 1 in the molten resin.

Also, for example, the third B sealing material 43b may be located between the first sealing material 41 and a region of one or more second installation parts B2 installed between the third solar cell 313 and the second connecting wiring part 3242 that is closer to the first protective member 1 than the plurality of solar cell cells 31. In other words, for example, the one or more second installation parts B2 installed between the third solar cell 313 and the second connecting wiring part 3242 may include a region between the third B sealing material 43b and the second sealing material 42 that is closer to the first protective member 1 than the plurality of solar cell cells 31. In this case, for example, even if the first resin material 941 that becomes the first sealing material 41 has high fluidity in a molten state during lamination processing, the second installation part B2 is unlikely to approach the first protective member 1 in the molten resin due to the presence of the second B resin material 943b that becomes the third B sealing material 43b.

<2-4. Fourth Modified Example>
In the first embodiment and each of the modified examples, for example, as shown in Fig. 23, the third A sealing material 43a, one or more first bridge parts B1, and the first connecting wiring part 3241 are assumed to be viewed in a plan view in a direction perpendicular to the first surface 1f. In this case, for example, as shown in Fig. 23 and Fig. 24, a configuration may be adopted in which the third A sealing material 43a overlaps from the center of at least one first bridge part B1 to the center of the first connecting wiring part 3241 in the -Y direction as the first direction. This configuration can be realized, for example, as shown in Fig. 25 and Fig. 26, in the lamination process of step S2, by arranging the second A resin material 943a so as to overlap from the center of at least one first bridge part B1 to the center of the first connecting wiring part 3241 in the -Y direction as the first direction. If this configuration is adopted, for example, during lamination processing in manufacturing the solar cell panel 101, the presence of the second A resin material 943a which becomes the third A sealing material 43a makes it difficult for the first installation part B1 to approach the first protective member 1 in the molten resin. As a result, for example, in the solar cell module 100, the thickness of the sealing material 4 present between the second string-shaped wiring part 322 and the first protective member 1 is unlikely to become thin.

Figure 25 shows a schematic diagram of the positional relationship between the first protective member 1, the first resin material 941, the second resin material 943, and the power generation unit 3, which are stacked together. For convenience, the third resin material 942 and the second protective member 2 are omitted from the illustration in Figure 25.

In the first embodiment and each of the modified examples, for example, as shown in FIG. 23, the third B sealing material 43b, one or more second bridge parts B2, and the second connecting wiring part 3242 are assumed to be viewed in a plan view in a direction perpendicular to the first surface 1f. In this case, for example, as shown in FIG. 23 and FIG. 27, the third B sealing material 43b may be configured to overlap from the center of at least one second bridge part B2 to the center of the second connecting wiring part 3242 in the +Y direction as the third direction. This configuration can be realized, for example, as shown in FIG. 25 and FIG. 28, in the lamination process of step S2, by arranging the second B resin material 943b so as to overlap from the center of at least one second bridge part B2 to the center of the second connecting wiring part 3242 in the +Y direction as the third direction. If this configuration is adopted, for example, during lamination processing in manufacturing the solar cell panel 101, the presence of the second B resin material 943b that becomes the third B sealing material 43b makes it difficult for the second installation part B2 to approach the first protective member 1 in the molten resin. As a result, for example, in the solar cell module 100, the thickness of the sealing material 4 that exists between the third string-shaped wiring part 323 and the first protective member 1 is unlikely to become thin.

<2-5. Other>
In the first embodiment and each of the modified examples, for example, the melt mass flow rate (MFR) of the second sealing material 42 may be smaller than the melt mass flow rate (MFR) of the first sealing material 41. The melt mass flow rate (MFR) of the second sealing material 42 is measured, for example, by the same method as that for measuring the melt mass flow rates (MFR) of the first sealing material 41 and the third sealing material 43. Here, for example, if the materials of the first sealing material 41 and the second sealing material 42 are non-crosslinked resins, the melt mass flow rate (MFR) of the third resin material 942 that becomes the second sealing material 42 can be smaller than the melt mass flow rate (MFR) of the first resin material 941 that becomes the first sealing material 41.

Here, for example, the rigidity of the power generation unit 3 in which the multiple solar cell cells 31 arranged along the virtual plane are connected by the string-like or band-like wiring part 32 is not high. Therefore, for example, if the melt mass flow rate (MFR) of the second sealing material 42 is lower than the melt mass flow rate (MFR) of the first sealing material 41, the sheet-like third resin material 942 that becomes the second sealing material 42 during the lamination process in manufacturing the solar cell panel 101 is likely to maintain a shape along the virtual plane even when melted. For this reason, for example, the multiple solar cell cells 31 arranged along the virtual plane are unlikely to shift from the virtual plane in the thickness direction of the solar cell panel 101. As a result, for example, a problem is unlikely to occur in which the solar cell cells 31 are shifted too far from the virtual plane during the lamination process, and the resin hardens to become the sealing material 4, causing a local tensile stress to be applied to the first string-like wiring part 321 installed between the solar cell cells 31. As a result, for example, the first string-like wiring portion 321 is less likely to peel off from the solar cell 31, and deterioration of the solar cell module 100 is less likely to occur.

Here, for example, a plate-like member having a thickness smaller than that of the first protective member 1 may be applied to the second protective member 2. For example, a glass substrate or the like is applied to the plate-like member. If such a configuration is adopted, for example, the water-proofing on the back surface F2 side of the solar cell module 100 can be improved while reducing the weight of the solar cell module 100. Also, for example, in the lamination process, the laminate 901 is placed on the heater plate of the laminator so that the first protective member 1 is arranged on the lower side, and while the laminate 901 is heated, a form is assumed in which the laminate 901 is pressed from above with a flexible diaphragm sheet. In this form, for example, the second protective member 2 is likely to bend together with the diaphragm sheet, and stress is locally concentrated at the end of the third resin material 942 in a molten state, and the third resin material 942 is likely to flow laterally and protrude from the end of the laminate 901. On the other hand, as described above, for example, if the melt mass flow rate (MFR) of the second sealing material 42 is smaller than the melt mass flow rate (MFR) of the first sealing material 41, the melt mass flow rate (MFR) of the third resin material 942 can be smaller than the melt mass flow rate (MFR) of the first resin material 941. For this reason, for example, even if stress is locally concentrated at the end of the third resin material 942 in a molten state in the lamination process, the third resin material 942 is unlikely to flow laterally and protrude from the end of the laminate 901. As a result, for example, in the solar cell panel 101, the thickness of the second sealing material 42 between the second protective member 2 and the wiring portion 32 can be sufficiently secured. As a result, for example, the insulation withstand voltage on the back surface F2 side of the solar cell module 100 is unlikely to decrease, and insulation deterioration of the second sealing material 42 is unlikely to occur.

In the first embodiment and each of the modified examples, for example, in the lamination process of step S3, when the laminate 901 is heated to a temperature exceeding the softening temperature of each of the first resin material 941, the second resin material 943, and the third resin material 942, the melt mass flow rate (MFR) of the third resin material 942 may be smaller than the melt mass flow rate (MFR) of the first resin material 941. The melt mass flow rate (MFR) of the first resin material 941 and the melt mass flow rate (MFR) of the third resin material 942 in the lamination process can be measured, for example, by a method conforming to JIS K7210 or ASTM D1238. Here, the measurement conditions of the melt mass flow rates (MFR) of the first resin material 941 and the third resin material 942 are set to the same measurement conditions. The conditions for measuring the melt mass flow rate (MFR) are, for example, that the temperature is the heating temperature of the lamination process and the load is a predetermined value (e.g., 2.16 kg).

Here, for example, the rigidity of the power generation unit 3 in which the multiple solar cell cells 31 arranged along the virtual plane are connected by the string-like or band-like wiring part 32 is not high. Therefore, for example, if the melt mass flow rate (MFR) of the third resin material 942 that becomes the second sealing material 42 is lower than the melt mass flow rate (MFR) of the first resin material 941 that becomes the first sealing material 41 during heating in the lamination process, the sheet-like third resin material 942 that becomes the second sealing material 42 is likely to maintain its shape along the virtual plane even when melted. For this reason, for example, the multiple solar cell cells 31 arranged along the virtual plane are unlikely to shift from the virtual plane in the thickness direction of the solar cell panel 101. As a result, for example, a problem is unlikely to occur in which the resin hardens to become the sealing material 4 when the solar cell cells 31 are shifted too far from the virtual plane during the lamination process, causing a local tensile stress to be applied to the first string-like wiring part 321 that is bridged between the solar cell cells 31. As a result, for example, the first string-like wiring portion 321 is less likely to peel off from the solar cell 31, and deterioration of the solar cell module 100 is less likely to occur.

Here, for example, if a plate-like member such as a glass substrate having a thickness smaller than that of the first protective member 1 is applied to the second protective member 2, the water-proofing on the back surface F2 side of the solar cell module 100 can be improved while reducing the weight of the solar cell module 100. Also, for example, in the lamination process, it is assumed that the laminate 901 is placed on the heater plate of a laminator with the first protective member 1 disposed on the lower side, and the laminate 901 is pressed from above with a flexible diaphragm sheet while being heated. In this case, as described above, for example, in the lamination process of step S3, if the melt mass flow rate (MFR) of the third resin material 942 is smaller than the melt mass flow rate (MFR) of the first resin material 941, even if stress is locally concentrated at the end of the molten third resin material 942, the third resin material 942 is unlikely to flow laterally and protrude from the end of the laminate 901. This allows, for example, the thickness of the second sealing material 42 between the second protective member 2 and the wiring portion 32 in the solar cell panel 101 to be sufficiently secured. As a result, for example, the insulation withstand voltage on the back surface F2 side of the solar cell module 100 is unlikely to decrease, and insulation deterioration of the second sealing material 42 is unlikely to occur.

In the first embodiment and each of the modified examples, for example, the cross-sectional shape of each of the first string-like wiring portion 321, the second string-like wiring portion 322, and the third string-like wiring portion 323 may be circular or polygonal. Circular cross-sectional shapes may include, for example, the perfect circular cross-sectional shape shown in FIG. 29 and the elliptical cross-sectional shape shown in FIG. 30. Polygonal cross-sectional shapes may include, for example, the triangular cross-sectional shape shown in FIG. 31 and the rectangular cross-sectional shape shown in FIG. 32. This may, for example, thin the first string-like wiring portion 321, the second string-like wiring portion 322, and the third string-like wiring portion 323, improving the power generation performance of the solar cell module 100.

In the first embodiment and each of the modified examples, for example, the names of the second string-like wiring portion 322, the first connecting wiring portion 3241, the first bridging portion B1, the third A sealing material 43a, and the second A resin material 943a, and the names of the third string-like wiring portion 323, the second connecting wiring portion 3242, the second bridging portion B2, the third B sealing material 43b, and the second B resin material 943b may be interchanged.

In the first embodiment and each of the modified examples, for example, a cross-linked resin may be used as at least one of the materials of the first sealing material 41 and the third sealing material 43. In this case, for example, in the lamination process of step S3, when the laminate 901 is heated to a temperature exceeding the softening temperatures of the first resin material 941, the second resin material 943, and the third resin material 942, a configuration may be adopted in which the melt mass flow rate (MFR) of the second resin material 943 is smaller than the melt mass flow rate (MFR) of the first resin material 941. Here, for example, after the lamination process, the melt mass flow rate (MFR) of the third sealing material 43 does not have to be smaller than the melt mass flow rate (MFR) of the first sealing material 41, and the softening temperature of the third sealing material 43 does not have to be equal to or higher than the softening temperature of the first sealing material 41.

Even if such a configuration is adopted, for example, during lamination processing, the presence of the second A resin material 943a makes it difficult for the first installation part B1 to approach the first protective member 1 in the resin in a molten state. As a result, for example, in the solar cell panel 101, the thickness of the sealing material 4 existing between the second string-shaped wiring part 322 and the first protective member 1 is unlikely to become thin. Also, for example, during lamination processing, the presence of the second B resin material 943b makes it difficult for the second installation part B2 to approach the first protective member 1 in the resin in a molten state. As a result, for example, in the solar cell panel 101, the thickness of the sealing material 4 existing between the third string-shaped wiring part 323 and the first protective member 1 is unlikely to become thin. As a result, for example, in the solar cell module 100, the insulation withstand voltage is unlikely to decrease, and insulation deterioration of the first sealing material 41 is unlikely to occur. Therefore, for example, in the solar cell module 100, the first sealing material 41 is unlikely to peel off from the second surface 1s of the first protective member 1, and the sealing performance of the first sealing material 41 is unlikely to decrease, so that the solar cell 31 is unlikely to deteriorate due to water infiltration, etc. Therefore, for example, the solar cell module 100 is unlikely to deteriorate.

In the first embodiment and each of the modified examples, for example, the material of the first protective member 1 may be a material other than glass, such as acrylic, as long as the first protective member 1 is translucent to light of a specific range of wavelengths.

In the first embodiment and each of the modified examples, for example, the first protective member 1 may be a membrane-like (also referred to as a film-like) member instead of a plate-like member. For example, a resin is applied as the material of this membrane-like member. In other words, a membrane-like member made of a resin having translucency may be adopted as the first protective member 1. For example, a thermoplastic resin such as polyethylene terephthalate (PET) or polycarbonate, or a fluorine-based resin is adopted as the resin applied to the first protective member 1. For example, the fluorine-based resin includes fluorinated ethylene propylene copolymer (FEP), ethylene-tetrafluoroethylene copolymer (ETFE), and ethylene-chlorotrifluoroethylene copolymer (ECTFE). Here, for example, the first protective member 1 may be composed of two or more layers of resin. In this case, the resin applied to the first protective member 1 may be, for example, two or more types of resin. Here, for example, if the resin applied to the first protective member 1 has weather resistance, the first protective member 1 is less likely to deteriorate, and the output of the solar cell module 100 is less likely to decrease. Here, weather resistance means the property of being less susceptible to deformation, discoloration, deterioration, and other changes when used outdoors. For example, fluorine-based resins such as FEP, ETFE, and ECTFE have weather resistance.

In the first embodiment and each of the modified examples, for example, the second protective member 2 may not be a film-like member, but may be a plate-like member having translucency, similar to the first protective member 1. The material of this plate-like member may be, for example, glass or resin. In this case, for example, a resin such as acrylic or polyethylene terephthalate (PET) may be used as the material of the second protective member 2. If this configuration is adopted, for example, water blocking on the back surface F2 side of the solar cell module 100 and translucency for light of a specific range of wavelengths can be realized. As a result, for example, in the solar cell module 100, the light irradiated to the back surface F2 can be transmitted through the second protective member 2 toward the power generation unit 3. As a result, for example, in the solar cell module 100, the light irradiated to the back surface F2 is also used for converting light energy to electrical energy in the power generation unit 3, and the photoelectric conversion efficiency of the solar cell module 100 can be improved.

It goes without saying that all or part of each of the above embodiments and various modified examples can be combined as appropriate and consistent.

REFERENCE SIGNS LIST 1 First protective member 100 Solar cell module 101 Solar cell panel 101g Gap 102 Frame 1f First surface 1s Second surface 2 Second protective member 2f Fourth surface 2t Third surface 3 Power generating section 31 Solar cell 311 First solar cell 312 Second solar cell 313 Third solar cell 32 Wiring section 321 First string-shaped wiring section 322 Second string-shaped wiring section 323 Third string-shaped wiring section 324 Connecting wiring section 3241 First connecting wiring section 3242 Second connecting wiring section 3s Solar cell string 4 Sealing material 41 First sealing material 42 Second sealing material 43 Third sealing material 43a ThirdA sealing material 43b ThirdB sealing material 901 Laminate 941 First resin material 942 Third resin material 943 Second resin material 943a 2nd A resin material 943b 2nd B resin material A11 Approach area B1 First construction part B2 Second construction part F1 Front side F2 Back side

Claims (16)

a first protective member in the form of a plate or film having a light-transmitting property and having a first surface and a second surface opposite to the first surface;
a plate-like or film-like second protective member having a third surface facing the second surface and a fourth surface opposite to the third surface;
a power generating section including a plurality of solar cells located along the second surface in a gap between the first protective member and the second protective member;
a first sealing material located at least between the second surface and the power generation unit and sealing the power generation unit from the first protective member side;
a second sealing material located at least between the third surface and the power generation unit and sealing the power generation unit from the second protective member side;
and a third sealing material,
The plurality of solar cells includes two or more solar cells arranged in a first direction along the second surface,
The two or more solar cells include a first solar cell located at an end of the two or more solar cells in the first direction,
the power generation unit includes a solar cell string including the two or more solar cells, a plurality of first string-like wiring portions electrically connecting the two or more solar cells, and a plurality of second string-like wiring portions electrically connected to the first solar cells and extending to a region of the gap that is located further in the first direction than the first solar cells, and a connecting wiring portion connecting the plurality of second string-like wiring portions;
the second string-like wiring portions each include a plurality of bridge portions each bridged between the first solar cell and the connecting wiring portion,
the third sealing material is located between one or more of the plurality of bridging portions and the first sealing material,
a melt mass-flow rate of the third sealing material is smaller than a melt mass-flow rate of the first sealing material;
A solar cell module, wherein the softening temperature of the third sealing material is equal to or higher than the softening temperature of the first sealing material. The solar cell module according to claim 1 ,
The one or more mounting portions include two or more mounting portions of the plurality of mounting portions. The solar cell module according to claim 2,
The one or more mounting portions include the plurality of mounting portions. The solar cell module according to any one of claims 1 to 3,
The one or more bridge portions include a proximity region between the third sealing material and the second sealing material that is closer to the first protective member than the plurality of solar cells. The solar cell module according to any one of claims 1 to 4,
A solar cell module, wherein a cross-sectional shape of each of the plurality of first string-shaped wiring portions and the plurality of second string-shaped wiring portions includes a polygonal shape or a circular shape. The solar cell module according to any one of claims 1 to 5,
A solar cell module, wherein when the third sealing material and the one or more mounting portions are viewed in a plane in a direction perpendicular to the first surface, the length of the third sealing material in the short side direction is greater than the line width of each of the one or more mounting portions. A solar cell module according to any one of claims 1 to 6,
A solar cell module, wherein when the third sealing material, the one or more mounting portions, and the connecting wiring portion are viewed in a plane in a direction perpendicular to the first surface, the third sealing material overlaps at least in the first direction from the center of the one or more mounting portions to the center of the connecting wiring portion. The solar cell module according to any one of claims 1 to 7,
A solar cell module, wherein a melt mass flow rate of the second encapsulant is smaller than a melt mass flow rate of the first encapsulant. (a) producing a laminate by laminating a plate-shaped or film-shaped first protective member having translucency, a sheet-shaped first resin material, a sheet-shaped second resin material, a power generating section including a plurality of solar cells, a sheet-shaped third resin material, and the plate-shaped or film-shaped second protective member;
(b) laminating the laminate to produce a solar cell panel;
The plurality of solar cells includes two or more solar cells arranged in a first direction,
The two or more solar cells include a first solar cell located at an end of the two or more solar cells in the first direction,
the power generation unit includes a solar cell string including the two or more solar cells, a plurality of first string-like wiring portions electrically connecting the two or more solar cells, and a plurality of second string-like wiring portions electrically connected to the first solar cells and extending to an area located further in the first direction than the first solar cells, and a connecting wiring portion connecting the plurality of second string-like wiring portions;
the second string-like wiring portions each include a plurality of bridge portions each bridged between the first solar cell and the connecting wiring portion,
In the step (a), the second resin material is disposed between the first resin material and one or more of the plurality of bridge portions;
In the step (b), the laminate is heated to a temperature exceeding the softening temperature of each of the first resin material, the second resin material, and the third resin material;
a melt mass flow rate of the second resin material at a heating temperature of the lamination process is smaller than a melt mass flow rate of the first resin material at a heating temperature of the lamination process . A method for producing a solar cell module according to claim 9, comprising the steps of:
A method for manufacturing a solar cell module, wherein in the step (a), the softening temperature of the second resin material is equal to or higher than the softening temperature of the first resin material. A method for producing a solar cell module according to claim 9 or 10, comprising the steps of:
A method for manufacturing a solar cell module, wherein the one or more installation portions include two or more installation portions of the plurality of installation portions. A method for producing a solar cell module according to claim 11, comprising the steps of:
The method for manufacturing a solar cell module, wherein the one or more installation portions include the plurality of installation portions. A method for manufacturing a solar cell module according to any one of claims 9 to 12, comprising the steps of:
A method for manufacturing a solar cell module, wherein a cross-sectional shape of each of the plurality of first string-shaped wiring portions and the plurality of second string-shaped wiring portions includes a polygonal shape or a circular shape. A method for manufacturing a solar cell module according to any one of claims 9 to 13, comprising the steps of:
A method for manufacturing a solar cell module, wherein in step (a), when the second resin material and the one or more mounting portions are viewed in a plane, the length of the second resin material in the short side direction is greater than the line width of each of the one or more mounting portions. A method for manufacturing a solar cell module according to any one of claims 9 to 14, comprising the steps of:
A method for manufacturing a solar cell module, wherein in the step (a), the second resin material is arranged so as to overlap at least in the first direction from the center of the one or more bridging portions to the center of the connecting wiring portion. A method for manufacturing a solar cell module according to any one of claims 9 to 15, comprising the steps of:
a melt mass flow rate of the third resin material at a heating temperature of the lamination process is smaller than a melt mass flow rate of the first resin material at the heating temperature of the lamination process .

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